强制UITypeEditor显示枚举类型的初始值

using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

// 自定义枚举类型
public enum MyEnum
{
    Value1,
    Value2,
    Value3
}

// 自定义UITypeEditor
public class MyEnumEditor : UITypeEditor
{
    // 指定编辑器样式为下拉框
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.DropDown;
    }

    // 处理编辑行为
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        if (provider != null)
        {
            // 获取Windows窗体服务
            IWindowsFormsEditorService editorService = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
            if (editorService != null)
            {
                // 创建一个下拉框控件
                ComboBox comboBox = new ComboBox();
                comboBox.DropDownStyle = ComboBoxStyle.DropDownList;

                // 添加枚举值到下拉框
                foreach (MyEnum enumValue in Enum.GetValues(typeof(MyEnum)))
                {
                    comboBox.Items.Add(enumValue);
                }

                // 设置下拉框选中的值
                comboBox.SelectedItem = value;

                // 显示下拉框
                editorService.DropDownControl(comboBox);

                // 返回编辑后的枚举值
                return comboBox.SelectedItem;
            }
        }

        return base.EditValue(context, provider, value);
    }

    // 指定是否支持绘制值
    public override bool GetPaintValueSupported(ITypeDescriptorContext context)
    {
        return true;
    }

    // 绘制初始值
    public override void PaintValue(PaintValueEventArgs e)
    {
        MyEnum enumValue = (MyEnum)e.Value;

        // 根据枚举值绘制相应的文本
        string enumText = Enum.GetName(typeof(MyEnum), enumValue);
        e.Graphics.DrawString(enumText, e.Font, SystemBrushes.ControlText, e.Bounds);
    }
}

// 自定义属性类，使用EditorAttribute指定自定义编辑器
public class MyPropertyClass
{
    [Editor(typeof(MyEnumEditor), typeof(UITypeEditor))]
    public MyEnum MyEnumProperty { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        // 创建自定义属性对象
        MyPropertyClass myProperty = new MyPropertyClass();

        // 获取属性描述器
        PropertyDescriptor descriptor = TypeDescriptor.GetProperties(myProperty)["MyEnumProperty"];

        // 获取属性的编辑器
        UITypeEditor editor = (UITypeEditor)descriptor.GetEditor(typeof(UITypeEditor));

        // 创建模拟服务提供者
        IServiceProvider provider = new MockServiceProvider();

        // 获取属性的初始值
        object value = descriptor.GetValue(myProperty);

        // 编辑属性值
        object editedValue = editor.EditValue(provider, value);

        // 更新属性值
        descriptor.SetValue(myProperty, editedValue);

        // 输出属性值
        Console.WriteLine(myProperty.MyEnumProperty);
    }
}

// 模拟的服务提供者实现
public class MockServiceProvider : IServiceProvider
{
    public object GetService(Type serviceType)
    {
        if (serviceType == typeof(IWindowsFormsEditorService))
        {
            // 在此可以返回一个自定义的Windows窗体服务实例
            return new MockWindowsFormsEditorService();
        }

        return null;
    }
}

// 模拟的Windows窗体服务实现
public class MockWindowsFormsEditorService : IWindowsFormsEditorService
{
    public void CloseDropDown()
    {
        // 实现关闭下拉框的逻辑
    }

    public void DropDownControl(Control control)
    {
        // 实现显示下拉框的逻辑
    }

    // 其他成员的实现
}